/*
 * Copyright (c) 2007-2012, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package com.sun.org.apache.bcel.internal.util;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache BCEL" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache BCEL", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

import java.io.*;

import java.util.Map;
import java.util.HashMap;

import com.sun.org.apache.bcel.internal.classfile.*;

/**
 * The repository maintains information about which classes have
 * been loaded.
 *
 * It loads its data from the ClassLoader implementation
 * passed into its constructor.
 *
 * @see com.sun.org.apache.bcel.internal.Repository
 *
 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
 * @author David Dixon-Peugh
 */
public class ClassLoaderRepository implements Repository {
    private java.lang.ClassLoader loader;
    private HashMap loadedClasses = new HashMap(); // CLASSNAME X JAVACLASS

    public ClassLoaderRepository(java.lang.ClassLoader loader) {
        this.loader = loader;
    }

    /**
     * Store a new JavaClass into this Repository.
     */
    public void storeClass(JavaClass clazz) {
        loadedClasses.put(clazz.getClassName(), clazz);
        clazz.setRepository(this);
    }

    /**
     * Remove class from repository
     */
    public void removeClass(JavaClass clazz) {
        loadedClasses.remove(clazz.getClassName());
    }

    /**
     * Find an already defined JavaClass.
     */
    public JavaClass findClass(String className) {
        if (loadedClasses.containsKey(className)) {
            return (JavaClass) loadedClasses.get(className);
        } else {
            return null;
        }
    }

    /**
     * Lookup a JavaClass object from the Class Name provided.
     */
    public JavaClass loadClass(String className) throws ClassNotFoundException {
        String classFile = className.replace('.', '/');

        JavaClass RC = findClass(className);
        if (RC != null) {
            return RC;
        }

        try {
            InputStream is = loader.getResourceAsStream(classFile + ".class");

            if (is == null) {
                throw new ClassNotFoundException(className + " not found.");
            }

            ClassParser parser = new ClassParser(is, className);
            RC = parser.parse();

            storeClass(RC);

            return RC;
        } catch (IOException e) {
            throw new ClassNotFoundException(e.toString());
        }
    }

    public JavaClass loadClass(Class clazz) throws ClassNotFoundException {
        return loadClass(clazz.getName());
    }

    /** Clear all entries from cache.
     */
    public void clear() {
        loadedClasses.clear();
    }
}
